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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.gallery3d.filtershow.pipeline;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
public abstract class ProcessingTask {
private ProcessingTaskController mTaskController;
private Handler mProcessingHandler;
private Handler mResultHandler;
private int mType;
private static final int DELAY = 300;
static interface Request {}
static interface Update {}
static interface Result {}
public boolean postRequest(Request message) {
Message msg = mProcessingHandler.obtainMessage(mType);
msg.obj = message;
if (isPriorityTask()) {
if (mProcessingHandler.hasMessages(getType())) {
return false;
}
mProcessingHandler.sendMessageAtFrontOfQueue(msg);
} else if (isDelayedTask()) {
if (mProcessingHandler.hasMessages(getType())) {
mProcessingHandler.removeMessages(getType());
}
mProcessingHandler.sendMessageDelayed(msg, DELAY);
} else {
mProcessingHandler.sendMessage(msg);
}
return true;
}
public void postUpdate(Update message) {
Message msg = mResultHandler.obtainMessage(mType);
msg.obj = message;
msg.arg1 = ProcessingTaskController.UPDATE;
mResultHandler.sendMessage(msg);
}
public void processRequest(Request message) {
Object result = doInBackground(message);
Message msg = mResultHandler.obtainMessage(mType);
msg.obj = result;
msg.arg1 = ProcessingTaskController.RESULT;
mResultHandler.sendMessage(msg);
}
public void added(ProcessingTaskController taskController) {
mTaskController = taskController;
mResultHandler = taskController.getResultHandler();
mProcessingHandler = taskController.getProcessingHandler();
mType = taskController.getReservedType();
}
public int getType() {
return mType;
}
public Context getContext() {
return mTaskController.getContext();
}
public abstract Result doInBackground(Request message);
public abstract void onResult(Result message);
public void onUpdate(Update message) {}
public boolean isPriorityTask() { return false; }
public boolean isDelayedTask() { return false; }
}
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